CN113217941B - Air preheater blockage prediction and water-spraying ammonia-spraying optimization anti-blocking method - Google Patents
Air preheater blockage prediction and water-spraying ammonia-spraying optimization anti-blocking method Download PDFInfo
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- CN113217941B CN113217941B CN202110418119.0A CN202110418119A CN113217941B CN 113217941 B CN113217941 B CN 113217941B CN 202110418119 A CN202110418119 A CN 202110418119A CN 113217941 B CN113217941 B CN 113217941B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Combustion & Propulsion (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an air preheater blockage prediction and water-spraying ammonia-spraying optimization anti-blocking method, which comprises the following steps: (1) establishing ABS initial deposition temperature and SO 3 Concentration and NH 3 Product of concentration [ SO ] 3 ]*[NH 3 ]Relational database and NH 3 Initial AS deposition temperature and SO under excess conditions 3 Concentration [ SO ] 3 ]An association database; (2) SO is carried out on the inlet of an air preheater in the flue of an actual power plant 3 And NH 3 Testing the concentration; (3) the characteristic parameter [ SO ] of the flue gas to be measured 3 ]*[NH 3 ]、[SO 3 ]Comparing the ABS deposition temperature with the established ABS and AS deposition temperature database, and obtaining the ABS and AS initial deposition characteristic temperature of the smoke to be detected according to the corresponding mapping relation; (4) according to the predicted ABS deposition temperature, the high-pressure water nozzle is intelligently adjusted to the corresponding position, the air preheater is subjected to water spraying cleaning, and the air preheater blockage caused by ABS deposition is prevented. The method is accurate and efficient, has low cost, and can effectively solve the problem of SO in the coal-fired flue gas 3 ABS blockage of the air preheater caused by reaction with escaping ammonia.
Description
Technical Field
The invention relates to the field of blockage prevention of air preheaters of tail flues, in particular to an air preheater blockage prediction and water-spraying ammonia-spraying optimization anti-blocking method.
Background
Coal used in coal-fired power plants generally contains a certain amount of SElements which are mainly converted to SO during boiler combustion 2 Accompanied by 1-2% SO 2 Further oxidized to SO 3 . In the tail flue gas treatment process, a selective catalytic reduction denitration (SCR) method is widely used. The SCR process may have about 0.5-2% SO 2 Is further catalytically oxidized into SO by a V/W/Ti catalyst 3 。SO 3 Extremely strong activity, SO 3 Can react with escaped ammonia in the flue gas to generate Ammonium Bisulfate (ABS), Ammonium Sulfate (AS) and other substances.
Wherein, the ammonium bisulfate is in a liquid state in the temperature range of the air preheater, has extremely high viscosity, can deposit on the heat exchange surface of the air preheater and adhere to fly ash, thereby forming scales and blockage on the air preheater. After the air preheater is blocked, the differential pressure of the inlet and outlet flues and the differential pressure of the air duct of the air preheater can be obviously increased, so that the power consumption of a fan is increased, even the output of an induced draft fan is too high, and the safe and economic operation of a boiler is seriously influenced. And when a large amount of ammonium bisulfate is deposited, the ammonium bisulfate is difficult to effectively remove by soot blowing. Therefore, the method has important significance for effectively predicting the deposition of the ABS in the air preheater and timely removing the ABS.
The ABS blockage in the air preheater is placed, and related patents and practices are provided. The patent with the application number of CN 212299053U discloses an electric heating type air preheater ammonium bisulfate blocks up placer, heats the corrugated metal plate through the electric heat mode, reaches the purpose of decomposing ammonium bisulfate. The prior art mainly decomposes ammonium bisulfate by adopting an electric heating mode, needs to arrange a large amount of electric wires on the corrugated plate of the air preheater, has large power consumption in the actual operation process, and improves the temperature of the corrugated plate of the air preheater, so that the corresponding change of a temperature field of smoke in the air preheater can possibly influence the normal operation of a unit.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides an air preheater blockage prediction and water spraying ammonia injection optimization anti-blocking method, and aims to provide a reliable and simple-operation air preheater blockage prediction method, and simultaneously carry out intelligent ammonia spraying water spraying regulation and control through the blockage position of the air preheater so as to relieve the blockage of the air preheater caused by the deposition of ammonium bisulfate. The method is suitable for coal burningSO is contained in tail flue gas of power plants, industrial boilers and the like 3 And NH 3 The blockage analysis and the blockage prevention regulation of the air preheater of the components.
In order to achieve the purpose, the invention provides an air preheater blockage prediction and water-spraying ammonia-spraying optimization anti-blocking method. The method comprises the following steps:
(1) establishing Ammonium Bisulfate (ABS) initial deposition temperature and SO 3 Concentration and NH 3 Product of concentration [ SO ] 3 ]*[NH 3 ]Relational database and NH 3 Initial temperature of sediment character change in air preheater (namely blockage relieving of air preheater) and SO under excessive condition 3 Concentration [ SO ] 3 ]And (5) associating the databases. By building an ABS deposition simulation system of the air preheater, the temperature change of the reaction system along with the flue gas flow is calibrated, and SO with different concentrations is introduced 3 And NH 3 And testing the initial deposition position and the property change position of the product under different conditions, and converting to obtain the initial deposition temperature and the property change temperature of the product under different conditions. Calculating the two characteristic temperatures and [ SO 3 ]*[NH 3 ]The mapping relation of the characteristic parameters establishes different SO in the air preheater 3 And NH 3 Initial deposition temperature and property change temperature of product under concentration condition and [ SO 3 ]*[NH 3 ]A correlation database of characteristic parameters;
(2) SO in front flue of air preheater to be detected 3 And NH 3 Detecting the concentration to obtain a characteristic parameter (SO) 3 ]*[NH 3 ]And [ SO 3 ]；
(3) Characteristic parameter [ SO ] in the smoke to be detected 3 ]*[NH 3 ]The ABS initial deposition blocking temperature and characteristic parameter [ SO3 ] of the air preheater established in the step (1)]*[NH 3 ]And comparing the correlation databases, and determining the initial position of the blockage in the air preheater according to the corresponding mapping relation. Intelligently adjusting the position of the high-pressure water spray gun head according to the predicted initial position, and starting the high-pressure water spray gun head at the corresponding position and at the rear part;
(4) judging SO in smoke to be detected 3 Concentration and NH 3 Concentration relative magnitude. If SO 3 Concentration less than NH 3 The concentration is according to SO 3 Concentration and step(1) And comparing the established blockage relieving temperature database of the air preheater, and determining the position of blockage relieving in the air preheater according to the corresponding mapping relation. According to the predicted relieving position, the high-pressure water gun head stops spraying water after the temperature is closed in an intelligent regulation mode. If SO 3 At a concentration greater than NH 3 The concentration is according to SO 3 Comparing the concentration with the air preheater blockage relieving temperature database suggested in the step (1), and determining NH according to the corresponding mapping relation 3 Closing the water spraying gun head at the position where the blockage in the air preheater is relieved under the excessive condition, and correspondingly opening the corresponding position NH 3 A spray head where ammonia is intelligently sprayed to make NH in the flue gas 3 SO with a concentration of greater than or equal to 3 And (4) concentration.
Generally, compared with the corresponding technology, the technical scheme of the invention mainly has the following technical advantages:
1. the method comprises the steps of firstly establishing a corresponding database based on experimental simulation, and testing SO in the to-be-detected flue gas 3 And NH 3 The initial blocking temperature and the blocking relieving temperature in the corresponding flue hollow preheater can be obtained according to the concentration, and the method has the advantages of wide applicability and accurate prediction;
2. the initial blocking position of the air preheater obtained by prediction in the invention can intelligently regulate and control the accurate opening and closing position of the high-pressure water spray gun head, so that the cleaning process of the air preheater is more targeted.
3. In addition, the present invention can mitigate the location of the air preheater blockage by predicting the location of the blockage at the SO 3 At a concentration lower than NH 3 Under the condition, the intelligent control high-pressure water gun is closed and the ammonia spraying gun head is opened to carry out ammonia spraying control, so that excessive water spraying of the air preheater can be avoided, and the air preheater is effectively prevented from being blocked due to ABS deposition.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of the present invention;
FIG. 2 shows the initial plugging temperature of the air preheater and the SO 3 *[NH 3 ]Mapping relation graph;
FIG. 3 is a schematic diagram of an example of an application of the first embodiment of the present invention to alleviate blockage in an air preheaterDegree and [ SO ] 3 ]A mapping relation graph;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The main reason for the blockage of the air preheater is due to SO in the flue gas 3 Reacts with escaped ammonia of a denitration system to generate ABS with strong viscosity. ABS is deposited on the surface of the heat exchange surface of the air preheater after being generated, and fly ash in smoke can be adhered to the ABS due to the viscosity of the ABS, so that the channel of the air preheater is blocked. ABS in the air preheater is mainly generated from SO in flue gas 3 And NH 3 In an amount mainly corresponding to SO in the flue gas 3 And NH 3 The concentration is relevant. The melting point of ABS is about 147 ℃, and the temperature of the smoke in the air preheater is gradually reduced from 360 ℃ to about 150 ℃. In the temperature range, the deposition temperature of the generated ammonium bisulfate is higher than the corresponding dew point temperature of the flue gas. Through a great deal of experimental research of the applicant, the initial deposition temperature of the ammonium bisulfate in the air preheater and the SO in the flue gas are found 3 And NH 3 The concentrations have a correlation. In addition, it was found by study that in different SO' s 3 And NH 3 At concentrations, the deposit in the air preheater is not just ABS. At NH 3 At a concentration of SO or more 3 In concentration, although the product at the initial deposition position in the air preheater is ABS, the product at the tail of the air preheater is AS. The AS is powder particles in the range of the smoke temperature of the air preheater, has no viscosity and can not cause the blockage of the air preheater.
Based on the above findings, the main technical scheme provided by the invention is as follows:
(1) establishing Ammonium Bisulfate (ABS) initial deposition temperature and SO 3 Concentration and NH 3 Product of concentration [ SO ] 3 ]*[NH 3 ]Association databaseAnd NH 3 Initial temperature of sediment character change in air preheater (namely blockage relieving of air preheater) and SO under excessive condition 3 Concentration [ SO ] 3 ]And (5) associating the databases. By building an ABS deposition simulation system of the air preheater, the temperature change of the reaction system along with the flue gas flow is calibrated, and SO with different concentrations is introduced 3 And NH 3 And testing the initial deposition position and the property change position of the product under different conditions, and converting to obtain the initial deposition temperature and the property change temperature of the product under different conditions. Calculating the two characteristic temperatures and [ SO ] 3 ]*[NH 3 ]The mapping relation of the characteristic parameters establishes different SO in the air preheater 3 And NH 3 Initial deposition temperature and property change temperature of product under concentration condition and [ SO 3 ]*[NH 3 ]A correlation database of characteristic parameters;
(2) SO in front flue of air preheater to be detected 3 And NH 3 Detecting the concentration to obtain a characteristic parameter (SO) 3 ]*[NH 3 ]And [ SO 3 ]；
(3) Characteristic parameter [ SO ] in the smoke to be detected 3 ]*[NH 3 ]The ABS initial deposition blocking temperature and characteristic parameter [ SO ] of the air preheater established in the step (1) 3 ]*[NH 3 ]And comparing the correlation databases, and determining the initial position of the blockage in the air preheater according to the corresponding mapping relation. Intelligently adjusting the position of the high-pressure water spray gun head according to the predicted initial position, and starting the high-pressure water spray gun head at the corresponding position and at the rear part;
(4) judging SO in smoke to be detected 3 Concentration and NH 3 Concentration relative magnitude. If SO 3 Concentration less than NH 3 The concentration is according to SO 3 And (3) comparing the concentration with the air preheater blockage relieving temperature database established in the step (1), and determining the position of blockage relieving in the air preheater according to the corresponding mapping relation. According to the predicted relieving position, the high-pressure water gun head stops spraying water after the temperature is closed in an intelligent regulation mode. If SO 3 At a concentration greater than NH 3 The concentration is according to SO 3 Comparing the concentration with the air preheater blockage relieving temperature database suggested in the step (1), and determining NH according to the corresponding mapping relation 3 Closing the spray gun head at the position where the blockage in the air preheater is relieved under the excessive condition, and correspondingly opening the corresponding position NH 3 A spray head where ammonia is intelligently sprayed to make NH in the flue gas 3 The concentration is greater than or equal to the corresponding SO3 concentration.
The following describes a first embodiment of the present invention, and an application example based on the first embodiment.
(1) Establishing ABS initial deposition blockage and blockage relieving temperature of air preheater and SO in flue gas 3 And NH 3 Correlation database of concentration: and (4) building an air preheater simulation system, and testing and calculating the initial blockage temperature and the blockage relieving temperature of the air preheater.
(1a) The air preheater simulation system firstly needs to calibrate the temperature to obtain the correlation between the temperature and the position. In order to make the result more accurate, the reaction process of different working conditions should be carried out for a long time (>48 hours), record the different SO 3 Concentration and NH 3 Initial position of sediment under concentration, and position of character change.
(1b) And obtaining the initial deposition blocking temperature and the blocking relieving temperature in the air preheater under corresponding conditions according to the experimental result obtained by the test. In the process, the chemical characteristics of the sediment at different temperatures are further detected through infrared spectroscopy, and the type of the sediment is determined, so that the temperature at the change position of the sediment character is verified to be the blockage relieving temperature.
(1c) Respectively calculating SO in 1(a) 3 Concentration and NH 3 Concentration and product of concentration [ SO ] 3 ]*[NH 3 ]And 1(b) the relationship between the initial deposition blocking temperature and the blocking relieving temperature respectively to obtain corresponding mapping relationships, and establishing SO 3 Concentration and NH 3 A database of correlations between concentrations and characteristic temperatures. More specifically, the concentration product [ SO ] may be separately multiplied 3 ]*[NH 3 ]As an abscissa and an initial deposition temperature as an ordinate, drawing a mapping relation curve graph of the two to obtain [ SO ] 3 ]*[NH 3 ]A correlation database with an air preheater plugging initiation temperature; adding SO 3 The concentration is used as an abscissa, the sediment character change temperature is used as an ordinate, and a mapping relation curve chart of the concentration and the sediment character change temperature is drawn to obtain [ SO ] 3 ]With air preheater stifledAn association database of plug mitigation temperatures. According to the process provided by the invention, in [ SO ] 3 ]*[NH 3 ]Correlation database with air preheater clogging initiation temperature and [ SO ] 3 ]The more corresponding experimental working conditions in the correlation database of the blockage relieving temperature of the air preheater are, the more the [ SO ] is established 3 ]*[NH 3 ]With the air preheater plugging initiation temperature and [ SO ] 3 ]The more mapping relationships with the air preheater blockage mitigation temperatures, the wider the database can be used.
(2) The air preheating blockage prediction specific process comprises the following steps: detecting SO at different positions in flue gas in flue to be detected 3 And NH 3 The concentration is compared and matched with the established database, and the corresponding concentration product [ SO ] is obtained through the mapping relation 3 ]*[NH 3 ]The ABS initial deposition temperature in the air preheater under the corresponding actual condition, namely the blocking starting temperature of the air preheater; and NH 3 Under the condition of excess, obtaining corresponding SO through mapping relation 3 Concentration [ SO ] 3 ]And (3) the initial deposition temperature of the AS in the air preheater under the corresponding actual condition, namely the blockage relieving temperature of the air preheater.
(3) Determination of SO 3 And NH 3 Concentration relative magnitude. SO (SO) 3 Concentration less than NH 3 During concentration, intelligently adjusting the initial water spraying position of the high-pressure water gun according to the initial blocking temperature and the blocking relieving temperature of the air preheater, and closing a nozzle of the water gun after the blocking relieving temperature; SO (SO) 3 At a concentration greater than NH 3 During concentration, the high-pressure water gun is started at the initial blocking position of the air preheater, the high-pressure water gun is closed at the relieving position of the air preheater, the ammonia nozzle is opened at the position, ammonia is sprayed into the channel of the air preheater, and the ammonia concentration is greater than or equal to SO 3 And (4) concentration.
In order to more clearly illustrate the embodiment, a coal-fired power plant is taken as an example to illustrate the specific implementation process of the invention.
1) Selecting SO 3 Concentration from 25ppm to 4000ppm, NH 3 With SO 3 The concentrations are respectively 1:1, 2:1 and 1:2, and ABS deposition simulation experiments of the air preheater are carried out to obtain the initial deposition temperature and the blockage relieving temperature in the air preheater under different conditions.
2) Air preheater under different conditionsInner initial deposition temperature and SO in flue gas 3 And NH 3 Product of concentration [ SO ] 3 ]*[NH 3 ]Mapping correlation is carried out, and the temperature and SO in the flue gas are relieved by blockage in the air preheater 3 Concentration [ SO ] 3 ]And carrying out mapping association. The corresponding mapping relationships in the present application example are shown in fig. 2 and fig. 3, respectively.
3) Measuring SO in actual power plant flue 3 And NH 3 Concentration, SO in flue gas in this example 3 At a concentration of 25ppm, NH 3 The concentration was 5 ppm.
4) The SO obtained will be tested 3 Concentration and NH 3 The concentration data is mapped into a corresponding database, and in the application example, the corresponding initial plugging temperature of the air preheater is 234.5 ℃ according to the mapping relation.
5) In this example, SO in flue gas 3 At a concentration greater than NH 3 The concentration and therefore the ammonia injection regulation should be carried out at the rear part of the air preheater. The initial blocking temperature of the air preheater obtained in the step 4) is 234.5, and the initial spraying position of the high-pressure water gun in the embodiment is a position where the temperature of flue gas in a flue is 234.5 ℃. According to the mapping relation shown in fig. 3, if the blockage relieving temperature of the air preheater is 182.2 ℃ when the ammonia gas is excessive in the embodiment, the embodiment stops the high-pressure water injection at the position where the flue gas temperature of the air preheater is 182.2 ℃, and compensates the injected ammonia gas to make the corresponding ammonia gas concentration be more than or equal to 25 ppm.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. An air preheater blockage prediction and water-spraying ammonia-spraying optimization anti-blocking method is characterized by comprising the following steps:
step (1) establishing ABS initial deposition temperature and SO 3 Concentration and NH 3 Product of concentration [ SO ] 3 ]*[ NH 3 ]Relational database and NH 3 Deposition in air preheater under excess conditionsTemperature and SO at the position where physical properties change 3 Concentration [ SO ] 3 ]An association database; by building an ABS deposition simulation system of the air preheater, the ABS deposition simulation system is calibrated to change along with the temperature of the flue gas flow, and SO with different concentrations is introduced 3 And NH 3 Testing the initial deposition position of the product and the position of the change position of the deposit character under different conditions, and converting to obtain the initial deposition temperature of the product and the temperature of the change position of the deposit character under different conditions; calculating the two characteristic temperatures and [ SO 3 ]*[ NH 3 ]The mapping relation of the characteristic parameters establishes different SO in the air preheater 3 And NH 3 Initial deposition temperature of product and temperature at which deposit properties change under concentration condition and [ SO ] 3 ]*[ NH 3 ]A correlation database of characteristic parameters;
step (2) SO in the front flue of the air preheater to be detected 3 And NH 3 Detecting the concentration to obtain a characteristic parameter (SO) 3 ]*[ NH 3 ]And [ SO 3 ]；
Step (3) characteristic parameter [ SO ] in the smoke to be detected 3 ]*[ NH 3 ]The ABS initial deposition temperature and characteristic parameter [ SO ] of the air preheater established in the step (1) 3 ]*[ NH 3 ]Comparing the correlation databases, and determining the initial position of the blockage in the air preheater according to the corresponding mapping relation; intelligently adjusting the position of the high-pressure water spray gun head according to the predicted initial position, and starting the high-pressure water spray gun head at the corresponding position and at the rear part;
step (4) judging SO in the smoke to be detected 3 Concentration and NH 3 Relative size of concentration if SO 3 Concentration less than NH 3 The concentration is according to SO 3 Concentration and ABS initial deposition temperature and SO established in step (1) 3 Concentration and NH 3 Product of concentration [ SO ] 3 ]*[ NH 3 ]Comparing the correlation databases, and determining the position of blockage relief in the air preheater according to the corresponding mapping relation; according to the predicted release position, intelligently adjusting the high-pressure water spraying gun head after closing the release position, and stopping spraying water; if SO 3 At a concentration greater than NH 3 The concentration is according to SO 3 Concentration and empty NH suggested in step (1) 3 Initial temperature and SO of deposit character change in air preheater under excessive condition 3 Concentration of [ SO 3 ]Comparing the associated databases, and determining NH according to the corresponding mapping relation 3 Closing the high-pressure water spray gun head at the position where the blockage in the air preheater is relieved under the excessive condition, correspondingly opening the ammonia spray gun head at the corresponding position, and intelligently spraying ammonia at the position to ensure that NH in the flue gas is 3 SO with a concentration of greater than or equal to 3 And (4) concentration.
2. The air preheater blockage prediction and water-spraying ammonia-spraying optimization blockage prevention method as claimed in claim 1, wherein the method comprises the following steps: simulation of SO in flue gas in database establishment process 3 And NH 3 Corresponding concentration range of 5 ppm to 4000ppm, corresponding to SO 3 : NH 3 Is 2:1, 1:1 or 1: 2.
3. The air preheater blockage prediction and water-spraying ammonia-spraying optimization blockage prevention method as claimed in claim 1, wherein the method comprises the following steps: NH in front flue of air preheater 3 With SO 3 And the concentration detection is respectively carried out by sampling and collecting through a sampling gun head, and then the corresponding concentration is detected through an ion chromatograph.
4. The air preheater blockage prediction and water-spraying ammonia-spraying optimization blockage prevention method as claimed in claim 1, wherein the method comprises the following steps: the mapping relation in the step (1) is used for reflecting SO in the flue gas 3 And NH 3 And (3) correlating the concentration product with the ABS initial deposition temperature in the air preheater and the temperature of the deposit character change position, so as to determine the initial deposition temperature in the air preheater and the temperature of the deposit character change position, directly determining the position of the high-pressure water spray gun head in the step (3), and determining the closing position of the high-pressure water spray gun and the opening position of the ammonia spray gun head in the step (4).
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| US6033637A (en) * | 1996-12-25 | 2000-03-07 | Kashima-Kita, Electric Power Corporation | Method for treating combustion ashes |
| JP2003126648A (en) * | 2001-10-22 | 2003-05-07 | Ishikawajima Harima Heavy Ind Co Ltd | Method for injecting ammonia in combustion gas and apparatus thereof |
| JP4906525B2 (en) * | 2007-01-26 | 2012-03-28 | ボッシュ株式会社 | Clogging determination device for reducing agent injection valve and clogging determination method for reducing agent injection valve |
| JP2009168357A (en) * | 2008-01-17 | 2009-07-30 | Chugoku Electric Power Co Inc:The | Attachment washing method and washing apparatus for air preheater |
| US7901647B2 (en) * | 2008-04-07 | 2011-03-08 | Babcock & Wilcox Power Generation Group, Inc. | Enhancement of conventional SCR and SNCR processes with ammonia destruction catalyst |
| CN103982906B (en) * | 2014-01-07 | 2016-04-06 | 霍特安热能技术（江苏）有限公司 | Be applicable to the Combined air preheater after SCR denitration and corrosion-and blocking-prevention method |
| CN205760637U (en) * | 2016-04-19 | 2016-12-07 | 大唐东北电力试验研究所有限公司 | The anti-blocking system of the air preheater of ammonia process SCR denitration unit |
| CN109724104B (en) * | 2018-12-06 | 2021-05-28 | 南京博沃科技发展有限公司 | Anti-ash-blockage air volume regulating and controlling method and operation monitoring device for air preheater |
| CN111445072B (en) * | 2020-03-26 | 2023-06-09 | 华润电力技术研究院有限公司 | Air preheater fault monitoring method and system based on parameter prediction |
| CN112648635B (en) * | 2020-11-06 | 2022-04-19 | 苏州西热节能环保技术有限公司 | Steam soot blowing optimization guidance method for boiler air preheater |
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